What structure suspends the lens in place?

What structure suspends the lens in place?

• A. Iris
• B. Ciliary body
• C. Retina
• D. Zonular fibers

Answer: (D)

The lens is held in place by the zonular fibers, also known as the zonules of Zinn. These delicate fibers radiate from the ciliary processes of the ciliary body and insert into the lens capsule around its equator, forming a suspensory apparatus that keeps the lens properly positioned behind the iris. The zonules transmit tension from the ciliary muscle to the lens: when the ciliary muscle contracts, tension on the zonules decreases, allowing the lens to become more spherical for near focus; when the ciliary muscle relaxes, tension increases, flattening the lens for distant vision. The iris and retina are not involved in suspending the lens; the zonular fibers are the actual suspension system.

The lens is held in place by the zonular fibers, also known as the zonules of Zinn. These delicate fibers radiate from the ciliary processes of the ciliary body and insert into the lens capsule around its equator, forming a suspensory apparatus that keeps the lens properly positioned behind the iris. The zonules transmit tension from the ciliary muscle to the lens: when the ciliary muscle contracts, tension on the zonules decreases, allowing the lens to become more spherical for near focus; when the ciliary muscle relaxes, tension increases, flattening the lens for distant vision. The iris and retina are not involved in suspending the lens; the zonular fibers are the actual suspension system.